scholarly journals On Laminar Rich Premixed Polydisperse Spray Flame Propagation with Heat Loss

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
G. Kats ◽  
J. B. Greenberg
Keyword(s):  
Heat Loss ◽  
Flame Propagation ◽  
Reaction Rate ◽  
Burning Velocity ◽  
Laminar Burning Velocity ◽  
Fuel Gas ◽  
Evaporation Coefficient ◽  
Spray Flame ◽  
Distributed Approximation ◽  
Main Factor

A mathematical analysis of laminar premixed spray flame propagation with heat loss is presented. The analysis makes use of a distributed approximation of the Arrhenius exponential term in the reaction rate expression and leads to an implicit expression for the laminar burning velocity dependent on the spray-related parameters for the fuel, gas-related parameters and the intensity of the heat losses. It is shown that the initial droplet load, the value of the evaporation coefficient, and the initial size distribution are the spray-related parameters which exert an influence on the onset of extinction. The combination of these parameters governs the manner in which the spray heat loss is distributed spatially and it is this feature that is the main factor, when taken together with volumetric heat loss, which determines the spray’s impact on flame propagation and extinction.

Characteristic of Low Calorific Fuel Gas Combustion in Porous Burner by Preheating Air

2014 ◽  
Vol 624 ◽  
pp. 361-365 ◽  
Author(s):  
Min Hui Fan ◽  
Guan Qing Wang ◽  
Dan Luo ◽  
Ri Zan Li ◽  
Ning Ding ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Flame Propagation ◽  
Reaction Rate ◽  
Combustion Characteristic ◽  
Gas Combustion ◽  
Fuel Gas ◽  
Flame Propagation Velocity ◽  
Co Oxidation Reaction ◽  
Porous Burner ◽  
Reaction Region

The combustion characteristic of low calorific fuel gas was numerically investigated in porous burner by preheating air. Two-dimensional temperature profile, flame propagation precess, and CO reaction rate were analyzed detailly by preheating air, and compared with that of room air. The results showed that when the air is preheated, the combustion flame location locates to upstream, the maximum combustion temperature is higher than that of room air, and flame propagation velocity decreases.The CO oxidation reaction rate increases gradually with the radius distance increaing, but reaction region decreases. CO oxidation region guradually decreases and locates to the upstream with air preheating temperature increasing. Peaks of CO oxidation rate gradually change from two to one.

scholarly journals Methane hydrogen laminar burning velocity blending laws in horizontal open-ended flame tube rig

2022 ◽  
Vol 1217 (1) ◽  
pp. 012013
Author(s):  
N A Amaludin ◽  
M Morrow ◽  
R Woolley ◽  
A E Amaludin
Keyword(s):  
Flame Propagation ◽  
Acoustic Pressure ◽  
Burning Velocity ◽  
Horizontal Tube ◽  
Hydrogen Gas ◽  
Hydrogen Fuel ◽  
Laminar Burning Velocity ◽  
Pressure Oscillations ◽  
Fuel Blends ◽  
Kinetics Of

Abstract Different fuel properties and chemical kinetics of two different fuels would make it challenging to predict the combustion parameters of a binary fuel. Understanding the effect of blending methane and hydrogen gas is the main focus of this paper. Utilizing a horizontal tube combustion rig, methane-hydrogen fuel blends were created using blending laws from past literature, over a range of equivalence ratios from 0.6 – 1.2 were studied, while keeping one combustion parameter constant, the theoretical laminar burning velocity. The selected theoretical laminar burning velocity for all the mixtures tested were kept constant at 0.6 ms−1. Different factors affected the flame propagation across the tube, including acoustic pressure oscillations, heat loss from the rig, and obvious difference in hydrogen percentage in the fuel blends. The average experimental laminar burning velocity of all the flames was 0.368 ms−1, compared to the expected value of 0.6 ms−1. In an attempt to keep the theoretical laminar burning velocity constant for different mixtures, it was discovered that this did not promise the same flame propagation behaviour for the tested mixtures. Further experimentation and analysis are required in order to better understand the underlying interaction of the fuel blends.

Flame propagation through dust clouds of carbon, coal, aluminium and magnesium in an environment of zero gravity

1983 ◽  
Vol 385 (1788) ◽  
pp. 21-51 ◽  
Keyword(s):  
Particle Size ◽  
Heat Loss ◽  
Flame Propagation ◽  
Burning Velocity ◽  
Dust Cloud ◽  
Volatile Matter ◽  
Dust Particles ◽  
Zero Gravity ◽  
Radiation Heat Loss ◽  
Dust Clouds

The mechanism and the rate of flame propagation through dust clouds of carbon, coal, aluminium and magnesium have been investigated. Any errors due to the upward buoyant motion of burnt gases and the downward settling velocity of dust particles were eliminated by conducting these experiments in a zero-gravity environment. A technique of flat-flame propagation was developed to measure the burning velocity accurately. The results show that the burning velocity is influenced by particle size, fuel transfer number, dust concentration, volatile matter (for coal), oxygen enrichment and heat loss by radiation from the burning fuel particles. A simple model to elucidate the structure and the mechanism of flame propagation is developed. Then expressions to predict the flame thickness and the burning velocity are derived. Attention is drawn to the similarity that exists between the mechanisms of flame propagation through dust clouds and through fuel mists. The importance of radiation heat loss is emphasized. It is shown that for a dust cloud of particle size 10 μ m of graphite or aluminium in oxygen, radiation loss from particles can reduce the burning velocity by as much as 40% or 25% respectively.

scholarly journals Laminar Burning Velocity of Methane/Air Mixtures and Flame Propagation Speed Close to the Chamber Wall

2017 ◽  
Vol 120 ◽  
pp. 126-133 ◽  
Author(s):  
Loreto Pizzuti ◽  
Cristiane A. Martins ◽  
Leila R. dos Santos ◽  
Danielle R.S. Guerra
Keyword(s):  
Flame Propagation ◽  
Burning Velocity ◽  
Propagation Speed ◽  
Chamber Wall ◽  
Laminar Burning Velocity ◽  
Flame Propagation Speed

Effects of CO content on laminar burning velocity of typical syngas by heat flux method and kinetic modeling

2014 ◽  
Vol 39 (17) ◽  
pp. 9534-9544 ◽  
Author(s):  
Yong He ◽  
Zhihua Wang ◽  
Wubin Weng ◽  
Yanqun Zhu ◽  
Junhu Zhou ◽  
...  
Keyword(s):  
Heat Flux ◽  
Kinetic Modeling ◽  
Burning Velocity ◽  
Laminar Burning Velocity ◽  
Flux Method

scholarly journals Laminar Burning Velocity of Biogas-Containing Mixtures. A Literature Review

Processes ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 996
Author(s):  
Venera Giurcan ◽  
Codina Movileanu ◽  
Adina Magdalena Musuc ◽  
Maria Mitu
Keyword(s):  
Gas Turbines ◽  
Internal Combustion Engines ◽  
Fossil Fuels ◽  
Combustion Engine ◽  
Burning Velocity ◽  
Internal Combustion ◽  
Electricity Production ◽  
Engine Fuel ◽  
Laminar Burning Velocity ◽  
Waste Products

Currently, the use of fossil fuels is very high and existing nature reserves are rapidly depleted. Therefore, researchers are turning their attention to find renewable fuels that have a low impact on the environment, to replace these fossil fuels. Biogas is a low-cost alternative, sustainable, renewable fuel existing worldwide. It can be produced by decomposition of vegetation or waste products of human and animal biological activity. This process is performed by microorganisms (such as methanogens and sulfate-reducing bacteria) by anaerobic digestion. Biogas can serve as a basis for heat and electricity production used for domestic heating and cooking. It can be also used to feed internal combustion engines, gas turbines, fuel cells, or cogeneration systems. In this paper, a comprehensive literature study regarding the laminar burning velocity of biogas-containing mixtures is presented. This study aims to characterize the use of biogas as IC (internal combustion) engine fuel, and to develop efficient safety recommendations and to predict and reduce the risk of fires and accidental explosions caused by biogas.

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